Bump Gradle Wrapper from 8.7 to 8.8 in /junit5-migration-gradle#419

junit-builds wants to merge 1 commit intomainjunit-team/junit-examples:mainfrom

wrapperbot/junit5-migration-gradle-sample/gradle-wrapper-8.8junit-team/junit-examples:wrapperbot/junit5-migration-gradle-sample/gradle-wrapper-8.8Copy head branch name to clipboard